Well, in my opinion, both parties began to try and differentiate themselves from each other. As time wore on the “political elite” of both parties sought disparate identities.
I believe the majority of US citizens tend to be center right or center left.
I don’t believe the majority of US citizens want a hostile and divided country either in race, sexual identity, economics or social class.
Most Americans don’t want a super restrictive administration governing them like “children.”
Neither do most Americans want their children indoctrinated in some political ideology/theory!
Most Americans are not in favor unlimited abortion even up to the time of birth.
Most Americans do not support unlimited immigration and “open border” policies!
Most Americans want to see an equal application of the laws, not fear or favor applied to any one political party, race or ideology!
Both parties avoided compromise with the opposition and “dug in” on their respective rhetoric.
Political division must be highly profitable or both parties would not thoroughly involve themselves in it!